Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas
Atlantic Water takes various pathways through the Nordic Seas, and its transformation to denser waters forms a crucial connection to the lower limb of the Atlantic Meridional Overturning Circulation. Circulation maps often schematize two distinct pathways of Atlantic Water: one following the Norwegi...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | https://hdl.handle.net/11250/2766155 https://doi.org/10.1029/2020JC016075 |
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ftunivbergen:oai:bora.uib.no:11250/2766155 2023-05-15T17:24:20+02:00 Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas Ypma, Stefanie Georgiou, S. Dugstad, Johannes Sandanger Pietrzak, J.D. Katsman, C.A. 2020 application/pdf https://hdl.handle.net/11250/2766155 https://doi.org/10.1029/2020JC016075 eng eng AGU urn:issn:2169-9275 https://hdl.handle.net/11250/2766155 https://doi.org/10.1029/2020JC016075 cristin:1827977 Journal of Geophysical Research (JGR): Oceans. 2020, 125(9), e2020JC016075 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020 The Authors e2020JC016075 Journal of Geophysical Research (JGR): Oceans 125 9 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1029/2020JC016075 2023-03-14T17:38:52Z Atlantic Water takes various pathways through the Nordic Seas, and its transformation to denser waters forms a crucial connection to the lower limb of the Atlantic Meridional Overturning Circulation. Circulation maps often schematize two distinct pathways of Atlantic Water: one following the Norwegian Atlantic Slope Current along the continental slope of Norway and one following the Norwegian Atlantic Front Current along the Mohn and Knipovich Ridges. In this paper, the connectivity between the northward flow along these ridges is investigated. Analyzing trajectories of surface drifters and ARGO floats, we find that only 8% of the floats that travel near the mid-ocean ridges take the frontal pathway to the north. Indeed, by tracing numerical particles in a realistic numerical simulation, part of the water mass traveling along the Mohn Ridge follows the 2,500 m isobath eastward and joins the slope current, instead of flowing north along the Knipovich Ridge. Furthermore, north of 74°N, frequent exchange between the slope current and the front current is observed. Therefore, the slope current and front current are less isolated than often schematized. Additionally, the observational data set reveals substantial cross-ridge exchange; 31% of the floats that travel within 60 km from the mid-ocean ridges cross it. Results from numerical simulations indicate that the cross-ridge exchange leads to cooling and freshening of the Atlantic Water along the front. Deployments of floats near the mid-ocean ridges are needed to investigate the pathway of Atlantic Water and its exchange across the ridge in more detail. publishedVersion Article in Journal/Newspaper Nordic Seas University of Bergen: Bergen Open Research Archive (BORA-UiB) Knipovich Ridge ENVELOPE(7.074,7.074,75.712,75.712) Norway Journal of Geophysical Research: Oceans 125 9 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Atlantic Water takes various pathways through the Nordic Seas, and its transformation to denser waters forms a crucial connection to the lower limb of the Atlantic Meridional Overturning Circulation. Circulation maps often schematize two distinct pathways of Atlantic Water: one following the Norwegian Atlantic Slope Current along the continental slope of Norway and one following the Norwegian Atlantic Front Current along the Mohn and Knipovich Ridges. In this paper, the connectivity between the northward flow along these ridges is investigated. Analyzing trajectories of surface drifters and ARGO floats, we find that only 8% of the floats that travel near the mid-ocean ridges take the frontal pathway to the north. Indeed, by tracing numerical particles in a realistic numerical simulation, part of the water mass traveling along the Mohn Ridge follows the 2,500 m isobath eastward and joins the slope current, instead of flowing north along the Knipovich Ridge. Furthermore, north of 74°N, frequent exchange between the slope current and the front current is observed. Therefore, the slope current and front current are less isolated than often schematized. Additionally, the observational data set reveals substantial cross-ridge exchange; 31% of the floats that travel within 60 km from the mid-ocean ridges cross it. Results from numerical simulations indicate that the cross-ridge exchange leads to cooling and freshening of the Atlantic Water along the front. Deployments of floats near the mid-ocean ridges are needed to investigate the pathway of Atlantic Water and its exchange across the ridge in more detail. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Ypma, Stefanie Georgiou, S. Dugstad, Johannes Sandanger Pietrzak, J.D. Katsman, C.A. |
spellingShingle |
Ypma, Stefanie Georgiou, S. Dugstad, Johannes Sandanger Pietrzak, J.D. Katsman, C.A. Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas |
author_facet |
Ypma, Stefanie Georgiou, S. Dugstad, Johannes Sandanger Pietrzak, J.D. Katsman, C.A. |
author_sort |
Ypma, Stefanie |
title |
Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas |
title_short |
Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas |
title_full |
Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas |
title_fullStr |
Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas |
title_full_unstemmed |
Pathways and Water Mass Transformation Along and Across the Mohn‐Knipovich Ridge in the Nordic Seas |
title_sort |
pathways and water mass transformation along and across the mohn‐knipovich ridge in the nordic seas |
publisher |
AGU |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2766155 https://doi.org/10.1029/2020JC016075 |
long_lat |
ENVELOPE(7.074,7.074,75.712,75.712) |
geographic |
Knipovich Ridge Norway |
geographic_facet |
Knipovich Ridge Norway |
genre |
Nordic Seas |
genre_facet |
Nordic Seas |
op_source |
e2020JC016075 Journal of Geophysical Research (JGR): Oceans 125 9 |
op_relation |
urn:issn:2169-9275 https://hdl.handle.net/11250/2766155 https://doi.org/10.1029/2020JC016075 cristin:1827977 Journal of Geophysical Research (JGR): Oceans. 2020, 125(9), e2020JC016075 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020 The Authors |
op_doi |
https://doi.org/10.1029/2020JC016075 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
9 |
_version_ |
1766115298527674368 |